Karl iiaake



(No Model.)

K. HAAKE.

APPARATUS FOR HOLDING AND TUNING STRINGS 0F PIANOS.

Paterited Jan. 1, 1895.

Wz/fnewrey I r1 4 UNITED STATES PATENT OFFICE.

KARL HAAKE, OF HANOVER, GERMANY, ASSIGNOR TO ROBERT THOMPSON, OF CHRISTCHURCH, NElV ZEALAND,

APPARATUS FOR HOLDING AND TUNING STRINGS OF PIANOS.

SPECIFICATION forming part of Letters Patent No. 531,631 dated January 1, 1895.

Application filed September 15, 1893. Serial No. 485,552. (No model.) Patented in England January 10, 1883, No. 420; in Victoria March 27, 1883 No. 5,730: in New South Wales August 6, 1888, No. 838; in New Zealand March 23, 1889, No.

3,371, and in South Australia July 2, 1339, No 1,342.

To all whom it may concern.-

Be it known that I, KARL HAAKE, of the city of Hanover, in the Empire of Germany, have made certain new and useful Improvements in Apparatus for Holding and Tuning the Strings of Pianos and other Instruments of the Like Kind, (for which I have obtained Letters Patent in Great Britain, dated J anuary 10, 1888, No. 120; in Victoria, dated March 1 o 27, 1888, No. 5,730; in New South Wales, dated August 6, 1838, No. 838; in New Zealand, dated March 23, 1889, No. 3,371, and in South Australia, dated July 2, 1889, No. 1,342,) and I hereby declare the following specification to be a full and clear description of the same, reference being had to the annexed drawings, making a part hereof.

This invention relates to devices by which the strings or wires of piano fortes are stretched more or less for the purpose of tuning them and more especially to those forms of such devices in which a screw is used operating a lever to which the wire or string is attached, the screw being turned as desired 2 5 by means of a suitable key; and the construction herein described and claimed is animprovement on the device patented by me in Letters Patent of the United States No. 461,217, dated October 13, 1S91,to which refo erence may be made formore complete information.

The present improvementcomprises a novel form of the lever and of the screws by means of which the string or wire is stretched and 3 5 the final tuning effected, the whole apparatus being simple, cheap and not liable to get out of order or become displaced.

The object of this improvement is to avoid the use of a separate notched pin or fulcrum bar for the lever to rest against as will appear hereinafter.

In the drawings-Figure l is a top View.

I Fig. 2 is a vertical longitudinal section and Fig. 3 is the lever. 4 5 The improvement is adapted to be used on either upright or other styles of pianos,

The usual style of string board may be em= ployed.

A. is a metal plate carrying the devices for holding and tightening the strings and is formed with a projecting rib a over which the strings pass.

B is the primary or rough tuning pin to which the string is attached and around which it is wound.

C. is a lever bar terminating at one end in a jammed nut b with a hole 0 in which the pin B is screwed, and is formed like a fork at the other end by the projections or prongs d,

d, as shown in Fig. 3.

D is the secondary tuning pin to be used for fine tuning. It passes between the prongs of the lever bar 0, and takes into the metal plate A. The upper sides of the prongs d, (1, are rounded as shown in Fig. 2 and a collar 6 5: e rests on them, through which the pin D passes and presses by reason of a shoulder at the base of its square portion f.

The under side of the lever bar next the plate A is formed in an angle, or wedge shaped, so the edge will be even with a line drawn through the center of the pin B at right angles to the string. The edge gof the wedge shaped part of the lever bar 0 is intended to be near or at the face of the plate A and the pin B passing through the lever bar is socketed into the pin plate A so as to admit of its oscillation, the object being to allow the pin B to be canted by pressure of the collarc, on the forked end of the lever bar, the edge of the front end of the bar at g, being free where it rests on the plate, subject to the combined pressure of the string 3, the pin D, and kept in place by the socketing of the pin B in the plate A at h, 3

The operation of this improvement will be readily understood. The pin B and bar C are firmly attached to each other and the string wound on said pin. The forked end is then passed under the collar 6, on the pin D and the bottom of the pin B being inserted in the socket h, in the plate A, until the point g rests on the plate, care being taken that the socket for the pin D is deep enough to permit proper adjustment of the parts, The slack 5 of the string may then be taken up and roughly tuned by winding 0n the pin B. The fine tuning is then done by turning the pin D. The ends of the pins are both made projecting rib a, the pin B socketed therein, ro square and of the proper size to fit the usual lever bar 0 and pin D threaded into the base wrench or tuning tool.

plate, all arranged substantially as and for I desire in this patent to cover the specific the purposes shown and described. mechanical arrangement and do not desire to claim generally a device for tuning with two KARL HAAKE' Witnesses:

Winn. GrilHNER,

S. HERRMANN.

pins.

I Vhat l claim as my invention is- The combination of the plate A having a 

